modelize_property: removed useless super_init var

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>
nitg-s/e: moved properties selection outside of layout builders.

The property selection is now made by the compiler rather than the layout builder

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>
nitg: Implemented polymorphic super calls for nitg-s and nitg-e

Signed-off-by: Alexandre Terrasa <alexandre@moz-code.org>
Merge remote-tracking branch 'alexandre/supercalls'